Possible Clues:

• Vehicle taken round bazaar, one with a place for tea
• There's scoffing here, with Conservative Party breaking into song
• Lunch lady locale
• About to attend a function before retrospective show in restaurant
• Constant song about celebration where food is served
• Eatery originally conveyed a festival atmosphere, on reflection
• Buffet -- feta and rice -- on a self-service counter
• Somewhere to eat around village event with retro atmosphere
• Celebrate in song after the end of shambolic eatery
• Where people are betrayed?